Good finding, SYLO has been obviously shilled by those accounts you mentioned.There is some big gap in thread activity from July 2019 up until June 2020, but only recent.ly they decided to rehire shills to hype this shitcoin. It's interesting coincidence that June 2020 was exactly the time when their token reached ATH and since then it lost its value by more than 80%.

Beside Sylo, one more ANN has been added to the list. Rubic shilling started recently, and while they are mostly using new accounts (well made in 2019/early 2020 but with no prior activity) few of them are also active in another ANN that is on the list already (Totem).
🎲 Rubic 🎲 Multichain DeFi platform